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This site is maintained by the MARGINS Office. Please share your comments and suggestions with us.
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Browse MARGINS
Awards in reverse chronological order after start
date (most recent first):
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Margins: Experimental Investigation of Hydrous Peridotite Melting
beneath Volcanic Arcs
| MARGINS Focus Area |
Subduction Factory |
| NSF Org |
EAR |
| Latest Amendment Date |
July 23, 2001 |
| Award Number |
0112013 |
| Award Instrument |
Standard Grant |
| Program Manager |
David Fountain
EAR DIVISION OF EARTH SCIENCES
GEO DIRECTORATE FOR GEOSCIENCES |
| Start Date |
July 1, 2001 |
| Expires |
June 30, 2004 (Estimated) |
| Expected Total Amount |
$229,745 (Estimated) |
| Investigator |
Glenn A. Gaetani (Principal
Investigator current) |
| Sponsor |
Woods Hole Ocean Inst
Woods Hole, MA 02543 |
| NSF Program |
1572 TECTONICS |
| Field Application |
0000099 Other Applications NEC |
| Abstract |
The objectives of this project are (1) to determine the compositional
characteristics and liquidus temperatures of hydrous partial melts
formed through fluxing of mantle peridotite by a H2O-rich component
from the subducted oceanic lithosphere, and (2) to measure mineral/melt
partition coefficients appropriate for modeling trace element fractionations
during partial melting of hydrous peridotite in the mantle wedge.
These goals are being achieved by determining experimentally (1)
the compositions of hydrous silicate melts in equilibrium with a
lherzolite mineral assemblage at 2.0 to 3.0 GPa, (2) the effect
on partial melting of adding variable amounts of a Na2O-K2O-H2O
subduction component to the peridotite, and (3) the partitioning
of incompatible trace elements between mantle minerals (clinopyroxene,
garnet, amphibole) and hydrous partial melts at conditions appropriate
for the mantle beneath volcanic arcs. The results from this experimental
study will provide petrologic and geochemical data necessary for
understanding the role of H2O in generating arc magmas and determining
the composition of material transferred from the mantle to the crust
by subduction-related magmatic processes. The results will also
help to provide a framework for interpreting samples from MARGINS
Focus Sites in the Izu-Bonin-Mariana and Central American subduction
systems. |
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